Light emitting device and light emitting module

Patent metadata

Field	Value
Publication number	US-11271371-B2
Application number	US-202016984176-A
Country	US
Kind code	B2
Filing date	Aug 4, 2020
Priority date	Jan 2, 2020
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

A light emitting device includes an edge emitting laser chip and a reflecting mirror. The edge emitting laser chip has light emitting ports arranged in parallel in a first direction. The light emitting ports emit light beams in a second direction. The reflecting mirror includes a reflecting surface used to reflect the light beams to a third direction. The first, second and third direction are perpendicular to each other. The light beams are emitted to the reflecting surface through the virtual incident plane and project first light spots on the reflecting surface. Each projected light spot has a first axis length in the first direction and a third axis length in the third direction. An interval between two immediately-adjacent light emitting ports is greater than the first axis length of one of the two projected light spots aligned with the two immediately-adjacent light emitting ports.

First claim

What is claimed is:

1. A light emitting device, comprising:
an edge emitting laser chip having a plurality of light emitting ports arranged in parallel in a first direction, wherein the light emitting ports of the edge emitting laser chip project a plurality of light beams in a second direction perpendicular to the first direction; and
a reflecting mirror comprising a reflecting surface used to reflect the light beams to a third direction perpendicular to the first direction and the second direction,
wherein the reflecting surface has a width in the first direction and a height in the third direction, the width and the height of the reflecting surface define a virtual incident plane at a front end of the reflecting surface, and the virtual incident plane is perpendicular to the second direction,
wherein the light beams are emitted to the reflecting surface through the virtual incident plane, the light beams project a plurality of first light spots on the reflecting surface, each of the light beams project a projected light spot on the virtual incident plane, each projected light spot has a first axis length in the first direction and a third axis length in the third direction, and an interval between two immediately-adjacent ones of the light emitting ports is greater than the first axis length of one of the two projected light spots that are at least partially aligned with the two immediately-adjacent ones of the light emitting ports.

2. The light emitting device of claim 1 , wherein the first light spots do not exceed a boundary of the reflecting surface.

3. The light emitting device of claim 1 , wherein the intervals between any two immediately-adjacent ones of the light emitting ports are equal.

4. The light emitting device of claim 1 , wherein the intervals between any two immediately-adjacent ones of the light emitting ports are different.

5. The light emitting device of claim 1 , wherein the projected light spots do not overlap each other on the virtual incident surface, and the first light spots do not overlap each other on the reflecting surface.

6. The light emitting device of claim 1 , wherein a sum of the first axis lengths of the projected light spots and distances between the projected light spots is less than the width of the virtual incident plane.

7. The light emitting device of claim 1 , wherein each third axis length is less than the height of the virtual incident surface.

8. A light emitting module, comprising:
the light emitting device of claim 1 , and
a diffuser facing the reflecting surface and disposed along the third direction, wherein the diffuser is used to receive the light beams reflected by the reflecting surface, the light beams reflected by the reflecting surface project a plurality of second light spots on the diffuser, and the second light spots on the diffuser do not overlap each other.

9. The light emitting module of claim 8 , wherein each second light spots has a first axis length along the first direction, the number of the second light spots is equal to the number of the first light spots, a sum of the first axis length of the second light spots and intervals between the second light spot is less than a length of the diffuser in the first direction.

10. The light emitting module of claim 8 , wherein the light emitting module comprises a base and a housing, the base and the housing are combined to form a holding space, the light emitting device is configured in the holding space, the housing comprises a illuminating outlet, and the diffuser is configured at the illuminating outlet of the housing.

11. The light emitting module of claim 10 , wherein the illuminating outlet comprises a first illuminating outlet and a second illuminating outlet, the first illuminating outlet is located between the holding space and the second illuminating outlet, and a width of the first illuminating outlet is less than a width of the second illuminating outlet.

12. The light emitting module of claim 11 , wherein the diffuser is at least partially located in the second illuminating outlet to cover the first illuminating outlet.

13. The light emitting module of claim 11 , wherein the housing comprises a trench located on a bottom of the second illuminating outlet.

Assignees

• Lextar Electronics Corp

Inventors

• Chen Ting-Kai
• Lai Lung-Kuan
• Liang Jian-Chin

Classifications

• H01S5/02325

  Mechanically integrated components on mount members or optical micro-benches · CPC title

• G01S7/4814 Primary

  of transmitters alone · CPC title

• H01S5/02255

  using beam deflecting elements · CPC title

• G01S7/481

  Constructional features, e.g. arrangements of optical elements · CPC title

• H01S5/0683

  by monitoring the optical output parameters · CPC title